Display screen with an icon



FIG. 1 is a front view of a display screen with an icon showing my new design; and,

FIG. 2 is a front view of an alternative embodiment of an icon for a display screen showing the design.

The broken line showing of the display screen is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a display screen with an icon, as shown and described. 